A bi-dimensional coding scheme applied to audio bitrate reduction

We present an audio bidimensional encoding scheme. Taking advantage of a new complex filter-bank, and of a regular lattice associated with a new hexagonal projection kernel, this scheme provides each step of the encoder and of the decoder with fast algorithms, which keeps the overall complexity low. Moreover variable or fix length encodings are available without a look-up table. The results show a very good quality at 80 kbit/s for monophonic signals, and a significant improvement with respect to normalized algorithms of a similar complexity.